4 ART. 5. — M. YOKOYAMA. 



the former the two basal pinnules of every pinna, one in front 

 of the rachis and the other behind it are different either in shape 

 or in mode of attachment to it, a character never observed in 

 the latter. Lastly it is said that the lateral veins of the pinnules 

 of Brongniart's species are more divergent, further apart, and 

 less divided than those of the pinnules of Presl's species. 



Although none of the specimens found at Yamanoi show 

 denticulated pinnules, yet the other characters, especially the 

 peculiarity in the two basal pinnules, being observable in them 

 the plant is now referred to the species tirst created by Brongniart. 



Very frequent, but mostly fragmentary. 



2. CLADOPHLEBIS YAMANOIENSIS Yok. 



Äsplenium Rœsserti var. whitbiensis Yokoyama, On Some 

 Fossil Plants from the Coal-bearing Series of Nagato, p. 242, pi. 

 XXXII, fig. 3, 3a, 4. 



Frond bi-or tripinnate. Principal rachis moderately strong 

 and rigid. Pinnse elongated, linear, alternate, slightly inclined 

 forward, rather widely separated so that there is more or less 

 space left between them. Pinnules falcate, those on the posterior 

 side of the pinnae being especially so, and also more strongly in- 

 clined forward than those on its anterior side, alternate, close 

 together, but separate to the base, bluntly pointed, thin in texture. 

 Midrib distinct, but diffusing into branches toward the end. 

 Lateral veins going off' obliquely at a very wide angle, divergent, 

 forking twice, except near the end where they are forked only 

 once. 



Although I formerly identified this fern with Cladophlebis 

 whitbiensis Brgnt., the strong forward inclination of the pinnules 



